Exhaust Control Research Articles

First application of the island divertor configuration in the J-TEXT tokamak

Abstract For the first time, an island divertor configuration was successfully implemented in the J-TEXT tokamak to improve heat exhaust and impurity control. The magnetic island is generated by applying external resonant magnetic perturbation fields, and the intersection between the edge island and the divertor target is then controlled by adjusting the edge safety factor qa, thereby achieving the island divertor configuration. The overall confinement is maintained in spite of the loss of the edge volume. The island divertor configuration significantly reduces peak heat-load on the divertor target by approximately 50% and improves impurity screening. Additionally, it effectively modulates radiation around the magnetic island's X-point, potentially enhancing the stability and control of radiative divertor operations. These findings highlight the island divertor configuration as a promising strategy for advancing heat exhaust and impurity control in tokamak operations.

Applying similar modeling to study vehicle exhaust transport in a confined mining space

To scientifically and effectively manage exhaust pollution in underground confined spaces and reduce hazards from personnel exhaust exposure, a systematic study of the distribution characteristics of diesel locomotive exhaust emissions in mines is needed. Aiming at large underground coal mining operations, an experimental platform for the physical simulation of vehicle exhaust transport in restricted spaces is designed and created. The Hongliulin Coal Mine in Shaanxi Province, China, is used as a prototype, and the platform consists of a coal mining face system, ventilation system, exhaust emission system, monitoring and surveillance system, and control platform. The experimental platform with carbon dioxide simulation of diesel exhaust pollution, in the role of different wind speed, the concentration of carbon dioxide is a downward trend, the wind speed is in the low wind speed on the 0.2 m of the concentration difference of 25.75%; the experimental platform exhaust transport process presents a clear “three-zone” change rule; experimental platform carbon dioxide concentration and the field nitrogen dioxide concentration change trend is consistent. The platform functions and features can provide guidance for mine exhaust management and exhaust exposure hazard prevention and control.

Energy analysis during cold start and warm up period of a methanol engine hybrid power system under several novel energy conversion strategies

The use of methanol in engine hybrid power system has a wide range of potential applications, with the primary challenge being cold start issues. This paper innovatively proposes four strategies for starting and warming up the methanol engine, including motor dragging, motor dragging coupled with exhaust gas recirculation (EGR), motor dragging coupled with exhaust control, and motor dragging coupled with both EGR and exhaust control. These strategies can be implemented in methanol hybrid power system with minimal hardware modification costs, and not generate any emissions compared to traditional gasoline assisted strategy. The warm-up mechanisms of these strategies were analyzed and their effectiveness was verified by experiments. The optimum strategy, motor dragging coupling both EGR and exhaust control, has been demonstrated to enhance power input and improve the energy conversion efficiency substantially. Compared to the traditional gasoline assisted strategy, the energy consumption, energy conversion efficiency and the warm-up time in this strategy are 17.9 % lower, 5.1 % higher, 4.2 s shorter, respectively. These strategies well solve the problem of methanol engines being unable to start at low temperatures, which is expected to eliminate the cold start of the engine and directly enter the hot start.

Global Trends in the Research and Development of Petrochemical Waste Gas from 1981 to 2022

As a highly energy-intensive and carbon-emitting industry with significant emissions of volatile organic compounds (VOCs), the petroleum and chemical industry is a major contributor to the global greenhouse effect and ozone layer destruction. Improper treatment of petrochemical waste gas (PWG) seriously harms human health and the natural environment. This study uses CiteSpace and VOSviewer to conduct a scientometric analysis of 1384 scholarly works on PWG and carbon sequestration published between 1981 and 2022, revealing the basic characteristics, knowledge base, research topic evolution, and research hotspots of the field. The results show the following: (1) In the early stages of the petrochemical industry, it was processed tail gas, plant leakage waste gas, and combustion flue gas that were investigated in PWG research. (2) Later, green environmental protection technology was widely studied in the field of PWG treatment, such as biotechnology, catalytic oxidation technology, membrane separation technology, etc., in order to achieve efficient, low energy consumption and low emissions of waste gas treatment, and the number of publications related to this topic has increased rapidly. In addition, researchers studied the internet of things and technology integration, such as the introduction of artificial intelligence, big data analysis, and other technologies, to improve the accuracy and efficiency of exhaust gas monitoring, control, and management. (3) The department has focused on how to reduce emissions by optimizing petrochemical process lines or improving energy efficiency. Emission reduction and low-carbon transition in the petrochemical industry will become the main trend in the future. Switching from renewable carbon to feedstock carbon derived from captured carbon dioxide, biomass, or recycled chemicals has become an attractive strategy to help curb emissions from the chemical industry. The results of our analysis can provide funding agencies and research groups with information to better understand the global trends and directions that have emerged in this field from 1981 to 2022 and serve as a reference for future research.

Control strategies for mode switching of a large marine two-stroke engine equipped with exhaust gas recirculation and turbocharger cut-off systems

To meet the stringent nitrogen oxides emissions regulations, the recent marine two-stroke engines are equipped with exhaust gas recirculation (EGR) systems. Crossing the boundaries of exhaust control areas requires switching between the engine operating modes associated with the activation or deactivation the EGR system, which imposes challenges to the engine operation. This study aims to develop and numerically test effective control strategies for improving the mode switching of marine two-stroke engines with EGR systems. The investigated engine dynamic model is developed by integrating a zero-dimensional thermodynamic model developed in GT-POWER and the control model developed in MATLAB/Simulink. This model is first validated against the experimentally measured engine performance parameters, and subsequently employed to simulate the engine dynamic operation with mode switching. The simulation results are assessed to quantify the impact of several control strategies on the engine performance. The derived perrformannce parameters time variations demonstrate that the deactivation of the EGR branch and the small engine–turbocharger result in exceeding the manufacturer limits at high loads and increasing the fuel consumption. The proposed load-based control strategies, which employ load thresholds and time delays for the control of the EGR and turbocharging systems activation/deactivation, are proved effective, as the engine performance parameters are retained within their limits and fuel consumption penalties are minimised. This study provides insights for developing the control of the marine engines after-treatment systems, hence contributing towards enhancing shipping sustainability.

Exhaustive control as movement: The case of Wolof

Exhaustive control as movement: The case of Wolof

X-point radiator and power exhaust control in configurations with multiple X-points in TCV

X-point radiator and power exhaust control in configurations with multiple X-points in TCV

Processing dissociations between raising and control in Brazilian Portuguese

Abstract Generative approaches to syntactic control have traditionally viewed it as a distinct component of the grammar, one that governs the interpretation and distribution of the empty category (EC) PRO. However, the Movement Theory of Control (MTC) proposes that control should instead be conceived of as a form of raising, with both sentence types involving the EC DP/NP Trace. In addition to theoretical arguments, some behavioral research on antecedent reactivation has demonstrated that different ECs reactivate their antecedents to different degrees and at different points in the time course of comprehension. In this study, we used a cross-modal repetition priming paradigm to examine antecedent reactivation in Brazilian Portuguese. We found significantly greater activation at the gap position in raising sentences and in those with overt pronouns as compared to (exhaustive) control sentences, consistent with the standard account of raising and the traditional view of control as involving a distinct EC. Additionally, we found some evidence for a differentiation between exhaustive and partial control structures. Overall, our results suggest that 1) similar linguistic mechanisms are employed in the processing of sentences that involve overt pronouns and DP/NP traces, and 2) different mechanisms are employed in the processing of raising and control structures, a finding we view as inconsistent with the MTC.

Effectiveness and efficiency of support schemes in promoting renewable energy sources in the Spanish electricity market

This research paper delves into the central mechanisms implemented in Spain to foster the adoption of clean energy projects. The study scrutinizes various mechanisms established from 2005 onwards, evaluating their efficacy in achieving the desired outcome of supporting clean energy project implementation. The aim is to comprehensively assess the associated costs, effectiveness, and attainment of renewable energy objectives stemming from implementing diverse support schemes. This paper explores the effectiveness of feed-in tariffs and feed-in premium mechanisms in promoting the integration of new renewable energy generation into the power system. However, the Spanish experience suggests that exhaustive planning control is imperative to prevent excessive support costs that could jeopardize the entire market and cause a significant rise in final energy costs. The research studies the support schemes and associated market distortion and presents the roadmap from regulated tariffs to a “total market” for wind and solar energy. The findings demonstrate that, under proper supervision and planning, a transitional retribution scheme effectively promotes renewable energy plant integration. Finally, the analysis examines the need to regulate the excess benefits that non-emitting power sources receive in a marginal price market, as this can lead to market imbalances and a substantial increase in final costs. These plans serve as a crucial tool in achieving the decarbonization objectives of the European Power System.

Transition mechanism of the coverage-dependent polymorphism of self-assembled melamine nanostructures on Au(111).

Molecular self-assembled films have recently attracted increasing attention within the field of nanotechnology as they offer a route to obtain new materials. However, careful selection of the molecular precursors and substrates, as well as exhaustive control of the system evolution is required to obtain the best possible outcome. The three-fold rotational symmetry of melamine molecules and their capability to form hydrogen bonds make them suitable candidates to synthesize this type of self-assembled network. In this work, we have studied the polymorphism of melamine nanostructures on Au(111) at room temperature. We find two coverage-dependent phases: a honeycomb structure (α-phase) for submonolayer coverage and a close-packed structure (β-phase) for full monolayer coverage. A combined scanning tunnel microscopy and density functional theory based-calculations study of the transition regime where both phases coexist allows describing the mechanism underlying this coverage driven phase transition in terms of the changes in the molecular lateral tension.

Therapeutic inertia in the management of hypertension by moroccan general practitioners

Abstract Background Hypertension is an important and remediable risk factor for cardiovascular disease. Therapeutic inertia has been identified as one of the main factors associated with poor blood pressure control. Purpose This study aims to evaluate predictive factors of therapeutic inertia in the management of hypertension among moroccan general practitioners. Methods We conducted a descriptive and analytical cross-sectional study, from October 2021 to January 2022, involving moroccan general practitioners using a standardized, anonymous questionnaire, covering numerous areas; their socio-demographic characteristics, assessment of hypertension knowledge, reasons not to intensify therapy and clinical scenarios. A univariate analysis was performed using the Chi-square test for the comparison of percentages. A multivariable logistic regression analysis was also applied to study variables possibly associated with therapeutic inertia. Results A total of 130 physicians participated in our study. The majority of the practitioners were female (62.3%). The average age was 38.61 years (±13,95). The percentage of physicians who had practiced for 5 years or less was 51.5% vs. 48,5% having practiced for more than 5 years. The median number of patients seen per day was estimated at 30 patients with an interquartile range of [15, 50]. The average medical visit time was estimated at 11,88 ± 7,03 minutes. The overall frequency of therapeutic inertia among general practitioners was estimated at 78,5% CI 95% [70,4-85,2]. Furthermore, the two main reasons for therapeutic abstention reported by physicians were: the importance of improving patient compliance, lifestyle and dietary measures before intensifying treatment (81,5%), in addition to the fact that the office blood pressure does not reflect the patient's "true" BP and didn’t need any further ambulatory monitoring (43,8%). Multivariable regression showed that when the patient is diabetic, the general practitioners tend to be 4 times more ‘therapeutically inert’ [OR 4.42 (95% CI 1.2–7.23)]. A patient’s history of ischemic stroke was also positively associated with TI [OR 1.53 (95% CI 1.23–4.23)]. Conclusion This study revealed a significant frequency of therapeutic inertia in primary care. A good understanding of the determinants of this phenomenon will lead to better management of hypertension and therefore better blood pressure control. According to our study, a history of diabetes or stroke was positively associated with inertia, even though this would normally require exhaustive BP control. Thus, the development of operational and consensual definitions based on empirical data and the exploration of the intimate mechanisms underlying this inertia is of crucial importance.Table 1

Innovative non-targeted liquid chromatography fingerprinting approach for authenticating tigernuts under Protected Designation of Origin quality seal.

Tigernut is a typical foodstuff from a specific region of Valencia (Spain) called 'L'Horta Nord', where it is commercialized under a Protected Designation of Origin (PDO) as Chufa de Valencia ('Valencia's tigernut'). PDO-recognized tigernuts present unique characteristics associated with their particular production region. Increasing demand and the associated expansion of its cultivation area has made necessary an exhaustive quality control to check the geographical origin and quality seal. In this work, a new multivariate analytical method capable of authenticating the PDO quality seal of tigernut samples was developed. Tigernut fat fraction was extracted under optimal conditions, applying the methodology of design of experiments. The analytical method combined fingerprinting methodology and chemometric tools to observe the natural grouping of samples using the exploratory analysis method and to develop classification models (partial least squares-discriminatory analysis; PLS-DA) to discriminate between two sample categories: (i) PDO tigernuts; and (ii) NON-PDO tigernuts. The built PLS-DA model demonstrated 100% accuracy, high sensitivity and specificity, revealing that the tigernut fat fraction can be applied to authenticate the PDO quality seal. © 2023 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

Molinist Thomist Calvinism: A Synthesis

AbstractAbstract: In recent years, attempts to reconcile God's exhaustive providential control over the future and human freedom frequently appeal to Molinism. Through the theory of Middle Knowledge, it is claimed, God can exercise meticulous providence over free creatures while preserving the libertarian agency of those creatures. Historically, both Thomist and Reformed theologians have critiqued the theory of Middle Knowledge for effectively eliminating God's aseity, making God's knowledge in some sense dependent on some non‐God reality. In this paper, I aim to push the discussion forward by integrating Thomist, Molinist, and Reformed perspectives in the view I call Molinist Thomist Calvinism. By resourcing each of these views, I try to offer a coherent way to affirm God's meticulous providence, including God's unconditional election of some and not others, and morally significant human freedom.

EMODnet Biology: Unlocking European marine biodiversity data

EMODnet Biology (hosted and coordinated by the Flanders Marine Institute (VLIZ)) is one of the seven themes within the European Marine Observation and Data network (EMODnet). The EMODnet Biology consortium aims to facilitate the accessibility and usage of marine biodiversity data. With the principle of "collect once, use many times" at its core, EMODnet Biology fosters collaboration across various sectors, including research, policy-making, industry, and individual citizens, to enhance knowledge sharing and inform decision-making. EMODnet Biology focuses on providing free and open access to comprehensive historical and recent data on the occurrence of marine species and their traits in all European regional seas. It achieves this through partnerships and collaboration with diverse international initiatives, such as the World Register of Marine Species (WoRMS), Marine Regions and the European node of the Ocean Biodiversity Information System (EurOBIS) among others. By promoting the usage of the Darwin Core Standard (Wieczorek et al. 2012), EMODnet Biology fosters data interoperability and ensures seamless integration with wider networks such as the Global Biodiversity Information Facility (GBIF) and the Ocean Biodiversity Information System (OBIS), serving as a significant data provider of the latter, as it is responsible for most of its data generated in Europe. Since its inception, EMODnet Biology has undertaken actions covering various areas, including providing access to marine biological data with spatio-temporal, taxonomic, environmental- and sampling-related information among others; developing an exhaustive data quality control tool based on the Darwin Core standard, the British Oceanographic Data Centre and Natural Environment Research Council Vocabulary Server (BODC NVS2) parameters and other controlled vocabularies used; creating and providing training courses to guide data providers; performing gap analyses to identify data quality and coverage shortcomings; creating and publishing marine biological distribution maps for various species or species groups; and interacting with international and European initiatives, projects and organizations. providing access to marine biological data with spatio-temporal, taxonomic, environmental- and sampling-related information among others; developing an exhaustive data quality control tool based on the Darwin Core standard, the British Oceanographic Data Centre and Natural Environment Research Council Vocabulary Server (BODC NVS2) parameters and other controlled vocabularies used; creating and providing training courses to guide data providers; performing gap analyses to identify data quality and coverage shortcomings; creating and publishing marine biological distribution maps for various species or species groups; and interacting with international and European initiatives, projects and organizations. Furthermore, EMODnet Biology contributes to the overall EMODnet initiative, which covers multidisciplinary data and products. Thanks to the use of standard protocols and tools across disciplines, EMODnet Biology products can contribute to multidisciplinary analysis of pressures and impacts on key marine species and habitats, and, lastly, support a better management and planning of the maritime space. In conclusion, EMODnet Biology plays a pivotal role in biodiversity informatics by providing users with a wealth of accessible and reusable marine biodiversity data and products. Its collaborative approach, extensive partnerships, and adherence to the FAIR (Findable, Accessible, Interoperable, Reusable) data principles (Wilkinson et al. 2016) as well as to the Infrastructure for Spatial Information in Europe (INSPIRE) metadata technical guidelines (European Commission Joint Research Centre 2013) and the Open Geospatial Consortium (OGC) standards make it a valuable resource for advancing knowledge, informing policies, and supporting sustainable management of marine ecosystems.

Gender Differences in Commuting: New Evidence from Spain

AbstractThis article examines the origins of the shorter commutes typically observed for women, a phenomenon that contributes to the poorer work outcomes they typically suffer. The analysis extends previous research on the gender gap in commuting by using econometric decomposition techniques that are novel in this field which, combined with a Spanish nationally representative survey that allows for an exhaustive control of the different elements identified in the literature as possible determinants of gender differences in commuting to work, allows quantifying the specific influence of a wide range of individual, family, territorial and work-related elements. The evidence obtained shows that the gender gap in commuting is not the result of the relative characteristics of women, but of the presence of a systematic pattern of lower mobility that emerges when women are compared with observationally similar men. Yet, this pattern of lower mobility is not observed for certain groups of women whose behavior in the labor market is generally more egalitarian, such as women with higher education, without family responsibilities or without a partner, which is consistent with the presence of cultural or social constraints that tend to limit women’s mobility.

Fine-grained high-performance Ba0.85Ca0.15 Zr0.1Ti0.9O3 piezoceramics obtained by current-controlled flash sintering of nanopowders

Due to environmental concerns, extensive research has been carried out to develop high-performance lead-free piezoceramics capable of replacing commercial lead-based materials. The lead-free (Ba0.7Ca0.3)TiO3 −Ba(Zr0.2Ti0.8)O3 system has emerged as a candidate for room temperature transducer applications because a high piezoelectric charge coefficient is achieved in this system for compositions at the morphotropic phase boundary. However, conventional ceramic processing of these eco-friendly piezoceramics demands high energy consumption because long-lasting, high-temperature heat treatments are needed, which often lead to microstructural degradation that compromises the material reliability. Field-assisted flash sintering has started to be explored since the application of an adequate electric field was shown to significantly reduce the sintering time and temperature, thereby controlling grain growth. In this work, Ba0.85Ca0.15Zr0.1Ti0.9O3 ceramics are obtained by current-controlled flash sintering of mechanosynthesized nanopowders. Exhaustive control of the sintering parameters allows tailoring of the microstructure, which allows dense fine-grained flash-sintered ceramics exhibiting a high electric field-induced strain response to be obtained.

Sulfites detection by surface-enhanced Raman spectroscopy: A feasibility study

The exhaustive control required for the correct wine production needs of many chemical analysis throughout the process. The most extended investigations for wine production control are focused on the quantification of total and free SO2. Most methods described in the literature have an adequate detection limit, but they usually lack reproducibility and require a previous sample treatment for the extraction of the SO2 from the wine-matrix. In this context, Surface-Enhanced Raman Spectroscopy (SERS) can be a promising technique for free SO2 determination without the need for any sample pre-processing. This work describes a proof of concept of a new methodology based on SERS and supported by Density Functional Theory (DFT) calculations to identify the active vibrational modes of the key molecules that contribute to the concentration of free SO2 in solution. Theoretical predictions and experimental outcomes are brought together to chemometrics to get a simple and real-time free SO2 monitoring. This general procedure could pave the way towards an implementation of a portable SERS detection module for in-field measurements.

Multiparametric cardiac magnetic resonance reveals persistent myocardial inflammation in patients with exertional heat illness.

To explore the clinical potential of multiparametric cardiac magnetic resonance (CMR) in evaluating myocardial inflammation in patients with exertional heat illness (EHI). This prospective study enrolled 28 males with EHI (18 patients with exertional heat exhaustion (EHE) and 10 with exertional heat stroke (EHS)) and 18 age-matched male healthy controls (HC). All subjects underwent multiparametric CMR, and 9 patients had follow-up CMR measurements 3months after recovery from EHI. CMR-derived left ventricular geometry, function, strain, native T1, extracellular volume (ECV), T2, T2*, and late gadolinium enhancement (LGE) were obtained and compared among different groups. Compared with HC, EHI patients showed increased global ECV, T2, and T2* values (22.6% ± 4.1 vs. 19.7% ± 1.7; 46.8ms ± 3.4 vs. 45.1ms ± 1.2; 25.5ms ± 2.2 vs. 23.8ms ± 1.7; all p < 0.05). Subgroup analysis showed that ECV was higher in the EHS patients than those in EHE and HC groups (24.7% ± 4.9 vs. 21.4% ± 3.2, 24.7% ± 4.9 vs. 19.7% ± 1.7; both p < 0.05). Repeated CMR measurements at 3months after baseline CMR showed persistently higher ECV than HC (p = 0.042). With multiparametric CMR, EHI patients demonstrated increased global ECV, T2, and persistent myocardial inflammation at 3-month follow-up after EHI episode. Therefore, multiparametric CMR might be an effective method in evaluating myocardial inflammation in patients with EHI. This study showed persistent myocardial inflammation after an exertional heat illness (EHI) episode demonstrated by multiparametric CMR, which is a potential promising method to evaluate the severity of myocardial inflammation and guide return to work, play, or duty in EHI patients. • EHI patients showed an increased global extracellular volume (ECV), late gadolinium enhancement, and T2 value, indicating myocardial edema and fibrosis. • ECV was higher in the exertional heat stroke patients than exertional heat exhaustion and healthy control groups (24.7% ± 4.9 vs. 21.4% ± 3.2, 24.7% ± 4.9 vs. 19.7% ± 1.7; both p < 0.05). • EHI patients showed persistent myocardial inflammation with higher ECV than healthy controls 3months after index CMR (22.3% ± 2.4 vs. 19.7% ± 1.7, p = 0.042).

Demonstration of Power Exhaust Control by Impurity Seeding in the Island Divertor at Wendelstein 7-X

Demonstration of Power Exhaust Control by Impurity Seeding in the Island Divertor at Wendelstein 7-X

Feeling exhausted: How outpatient physical therapists perceive and manage job stressors.

Burnout is identified as a workplace problem rather than a worker problem. However, it remains unclear what job stressors are associated with burnout among outpatient physical therapists. Thus, the primary objective of this study was to understand the burnout experiences of outpatient physical therapists. The secondary aim was to identify the relationship between physical therapist burnout and the work setting. One-on-one interviews based on hermeneutics were used for qualitative analysis. Quantitative data was collected using the Maslach Burnout Inventory-Health Services Survey (MBI-HSS) and the Areas of Worklife Survey (AWS). Qualitative analysis found participants interpreted an increased workload with no increase in wages, loss of control, and a mismatch between organizational culture and values as the main drivers of organizational stress. Professional issues such as high debt burden, low salaries, and declining reimbursement emerged as stressors. Participants showed moderate to high emotional exhaustion per the MBI-HSS. There was a statistically significant association between emotional exhaustion and workload and control (p<0.001). For every one-point increase in workload, emotional exhaustion increased by 6.49 while for every one-point increase in control, emotional exhaustion decreased by 4.17. Outpatient physical therapists in this study felt that increased workload with a lack of incentives and inequity, coupled with a loss of control, and a mismatch between personal and organizational values were significant job stressors. Creating awareness of outpatient physical therapist's perceived stressors may play an important role in developing strategies to diminish or prevent burnout.